Lady Gabriella Windsor and Thomas Kingston leave after marrying in St George\'s Chapel on May 18, 2019 in Windsor, England.

Lady Gabriella Windsor and Thomas Kingston leave after marrying in St George's Chapel on May 18, 2019 in Windsor, England.Getty

Buckingham Palace has announced the sudden death of Thomas Kingston, husband of Lady Gabriella Kingston and son-in-law of Prince and Princess Michael of Kent. 

Mr Kingston (45) was found dead at an address in Gloucestershire on Sunday, February 25, with emergency services called to the scene. There were no suspicious circumstances and no one else was involved.

A statement made on behalf of Mr Kingston's family said: "It is with the deepest sorrow that we announce the death of Thomas Kingston, our beloved husband, son and brother.

"Tom was an exceptional man who lit up the lives of all who knew him. His death has come as a great shock to the whole family and we ask you to respect our privacy as we mourn his passing."

The death was described as a "great shock to the whole family".

A Buckingham Palace spokesman said that King Charles and Queen Camilla "join Prince and Princess Michael of Kent and all those who knew him in grieving a much-loved member of the family".

Lady Gabriella is the King's second cousin. They are both great-grandchildren of King George V

Mr Kingston and Lady Gabriella Windsor married in 2019 at St George's Chapel, in Windsor Castle, with Queen Elizabeth II and her husband the Duke of Edinburgh as well as Prince William and Prince Harry, among the guests.

Earlier this week Prince William unexpectedly withdrew from a memorial service for the late former King Constantine of Greece over an unspecified "personal matter", but it is believed that was not connected to the news about Mr Kingston.

Lady Gabriella is not a working member of the Royal Family but it is understood that she and her late husband's relatives are being supported by the Royal Household.